The boy would have died, _______ on him without delay.
A．if the doctor didn’t operateB．if the doctor wouldn’t operate
C．would the doctor not operateD．had the doctor not operated
D
考查虛擬語氣條件句的倒裝。句意：要不是這個(gè)醫(yī)生立即給他動(dòng)了手術(shù)，這個(gè)男孩本來會(huì)死的�！皐ould+have+done”表示對(duì)過去事情的假設(shè)，意思是“本來會(huì)做”。結(jié)合語境可知條件句中描述的是已經(jīng)完成的動(dòng)作，選項(xiàng)ABC時(shí)態(tài)有誤。虛擬語氣條件從句不一定都要出現(xiàn)if，因?yàn)橛行⿻r(shí)候可以把助動(dòng)詞提前來達(dá)到省略if的作用，故選D。
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